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High-frequency module

Active Publication Date: 2016-11-03
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a structure that allows for easy placement of a first inductor and easy adjustment of the characteristics of a sub transmission path. The use of a matching inductor and the first inductor in a structure also increases the effective inductance values, which results in smaller linear electrodes and reduces the size of the high-frequency module.

Problems solved by technology

This increases the number of constituent elements in the filter circuit and thus increases the size of the filter circuit, and is therefore unsuitable for current mobile terminals and the like, which require increased miniaturization.

Method used

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Examples

Experimental program
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Effect test

first circuit example

[0076]In the high-frequency module 11 illustrated in FIG. 1, the filter section 20 includes a fourth connection terminal P251 connected to a connection line between the first connection terminal P21 and the SAW resonator 201, and a fifth connection terminal P252 connected to a connection line between the SAW resonator 202 and the SAW resonator 203.

[0077]The high-frequency module 11 includes an inductor 70, external to the filter section 20, that is connected at one end to the fourth connection terminal P251 and connected at another end to the fifth connection terminal P252. In other words, the inductor 70 is connected in parallel to a series circuit constituted of the SAW resonator 201 and the SAW resonator 202 through the fourth connection terminal P251 and the fifth connection terminal P252. The inductor 70 corresponds to a “first inductor”.

[0078]In the high-frequency module 11 according to the first circuit example, when a high-frequency signal propagates from the first external ...

second circuit example

[0086]Next, the high-frequency module 12 according to the second circuit example illustrated in FIG. 2 will be described.

[0087]The high-frequency module 12 differs from the high-frequency module 11 according to the first circuit example illustrated in FIG. 1 in that the structure of the above-described coupling circuit is different.

[0088]To be more specific, the high-frequency module 12 differs from the high-frequency module 11 in that the high-frequency module 12 includes the shunt-connected matching element 44 instead of the series-connected matching element 42, and in that a coupling circuit is defined by inductive coupling or capacitive coupling between the inductor 70 and the matching element 44.

[0089]In the high-frequency module 12, the high-frequency signal partially propagates in the sub transmission path that uses the coupling circuit as a transmission path. As such, like the above-described high-frequency module 11, the high-frequency module 12 achieves the desired attenua...

third circuit example

[0090]Next, the high-frequency module 13 according to the third circuit example illustrated in FIG. 3 will be described.

[0091]The high-frequency module 13 differs from the high-frequency module 11 according to the first circuit example illustrated in FIG. 1 in that the connection state of the inductor 70 and the structure of the above-described coupling circuit are different.

[0092]In the high-frequency module 13, the filter section 20 includes a fourth connection terminal P261 connected to a connection line between the SAW resonator 206 and the SAW resonator 207, and a fifth connection terminal P262 connected to a connection line between the SAW resonator 208 and the second connection terminal P22.

[0093]The inductor 70 is connected in parallel to a series circuit including the SAW resonator 207 and the SAW resonator 208 through the fourth connection terminal P261 and the fifth connection terminal P262.

[0094]In the high-frequency module 13 according to the third circuit example, a co...

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Abstract

In a high frequency module, in addition to a main transmission path in which a high-frequency signal propagates in first filter elements, a sub transmission path is defined by inductive coupling or capacitive coupling between a first inductor and a matching element or by inductive coupling between the first inductor and a second inductor. The sub transmission path has different amplitude characteristics and phase characteristics from those of the main transmission path depending on a degree of the inductive coupling or capacitive coupling, and transmission characteristics as a high-frequency module are adjustable by adjusting the amplitude characteristics and the phase characteristics of the sub transmission path.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority to Japanese Patent Application 2014-002803 filed Jan. 10, 2014 and is a Continuation Application of PCT / JP2014 / 077376 filed on Oct. 15, 2014. The entire contents of each application are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a high-frequency module including a plurality of filter elements.[0004]2. Description of the Related Art[0005]In mobile devices and the like having wireless communication functions, a filter circuit is used to allow only a high-frequency signal at a desired frequency to pass and attenuate high-frequency signals at frequencies aside from the desired frequency.[0006]For example, Japanese Unexamined Patent Application Publication No. 2012-109818 discloses a filter circuit including a plurality of SAW (surface acoustic wave) filters. Specifically, in the filter circuit according to Jap...

Claims

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Application Information

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IPC IPC(8): H03H9/72H05K1/02H03H9/64H03H9/00H03H9/05H03H9/10
CPCH03H9/725H03H9/0542H03H9/059H03H9/1071H05K2201/1006H03H9/0009H05K1/0243H05K1/0298H03H9/6433H03H7/09H03H9/6483
Inventor TAKEUCHI, MORIOKAWASAKI, KOICHIROKONAKA, YOHEI
Owner MURATA MFG CO LTD
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